cleaned up xConfig and xConfigLoader classes
try loading first from filesystem, then from jar resource
added clone() to xConfig class
added Save() to xConfigLoader class
using this. where needed, and using utils.isEmpty()
added ensureUnique() and getLastPart() functions to utilsString class
few fixes to replaceWith() in utilsString class
return data rather than throw exception if invalid arg
fixes references to utilsNumbers class